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近年来,由于轴承的高速旋转和小型化,因此要求其具有优良的性能。特别是汽车工业,为了缩小车辆的尺寸和减少燃料消耗,对此的要求尤为强烈。另一方面,电子工业也需要非常小的、能节约功率以及装置变小时震动少的轴承。尽管是这样一种苛刻的用途,但却要求轴承的寿命比过去长。然而,由于轴承滚珠上不时会发生剥落,因而很难延长寿命。另一方面,用于硬盘驱动器主轴电动机中的微型滚珠需要夹杂物含量极少的清洁轴承钢。照片1示出了在微型轴承滚珠表面上所观察到的有害夹杂物。为了满足这些要求,作者通过减少氧化物和氮化物夹杂提高钢的清洁度。结果是在神户和加古川钢厂开发出了超清洁高碳铬轴承钢。本文报导了超清洁钢的生产工艺、各种性能以及钢清洁度新的评定方法。
In recent years, due to the high-speed rotation of the bearing and miniaturization, it is required to have excellent performance. Particularly in the automotive industry, this is particularly true for reducing the size of vehicles and reducing fuel consumption. On the other hand, the electronics industry also needs very small bearings that save power and vibrate less when the unit becomes smaller. Despite such a harsh use, but requires the bearing life expectancy than the past. However, life spans can be difficult to extend due to spalling on the bearing balls from time to time. On the other hand, miniature balls for use in hard disk drive spindle motors require clean bearing steel with very low levels of inclusions. Photo 1 shows the harmful inclusions observed on the miniature bearing ball surfaces. To meet these requirements, the authors improve steel cleanliness by reducing oxide and nitride inclusions. As a result, ultra-clean high-carbon chromium bearing steels have been developed at Kobe and Kakogawa Steel Works. This article reports on the production of ultra-clean steel, a variety of performance and new steel cleanliness assessment methods.